Group 1 Alkaline Metals Chemical Properties

An atom of element X has three electron shells. When element X reacts with chlorine, it forms a white compound with the formula XCl. Which of the following is element X? (Given the proton number of Li,3; Na,11; Mg, 12; K,19)

• Lithium

• Sodium

• Magnesium

• Potassium

Which statement concerning the ions of Group 1 elements is correct?

• Each has one electron in its outer electron shell.

• Each contains the same number of protons and electrons.

• Each contains more electrons than protons.

• Each contains more protons than electrons.

Caesium is an element below potassium in Group 1 of the Periodic Table. Which of the following statements about caesium is not correct?

• It forms an insoluble hydroxide.

• It reacts violently with cold water.

• It is more reactive than potassium.

• It burns in air to form an oxide with the formula Cs₂O.

An element Y reacts with cold water. Which of the following is the likely proton number of Y?

• 4

• 9

• 11

• 15

Diagram shows the method used to store an element. Which of the following explain why the method is used?

• The element is toxic and dangerous.

• To avoid from reaction with sunlight.

• To avoid from reaction with oxygen in the air.

• The element is reactive and volatile.

Which of the following metals burns with a very bright lilac purplish flame in a gas jar filled with oxygen and produces a white residue?

• Lead

• Silver

• Sodium

• Potassium

Element P shows the following properties:

a)Reacts vigorously with cold water

b)Produces a white solid substance with the formula PCl when burned in chlorine gas.

Based on the above information, which of the following is the electron configuration of the atom of element P?

• 2.8.8.2

• 2.8.8

• 2.8.7

• 2.8.1

Francium (Fr) is placed below rubidium in Group 1 of the Periodic Table. Based on this information, it can be predicted that francium

I) produces a water soluble carbonate

II) forms the ion Fr⁺

III)reacts vigorously with water

IV) is a very electropositive element

• I and III only

• II and IV only

• I,II and III only

• I,II,III and IV

What is the gas R in the diagram?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon

The table shows the observation recorded when a small piece of burning alkali metal is placed into a gas jar filled with oxygen.

Arrange the metals in decreasing order of reactivity.

• Lithium, sodium,potassium

• Sodium, lithium, potassium

• Potassium, sodium, lithium

• Potassium, lithium, sodium